Buffet is only saying you can't make money off debt at this time. This is true. You can't. Positive interest rates mean profit if you lend. Negative interest rates mean, at best, no profit and possibly a loss.

Buffet (and Soros) have the luxury of waiting it out, for a later profit. The rest of us will be happy to get out what we put in: not making a profit is not the end of the world.